<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <div id="app">
        <h2>{{fullName}}</h2>
    </div>
    <script src="../js/vue.js"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                message:'你好呀！',
                firstName:'wang',
                lastName:'ting'
            },
            computed:{
                // fullName:function(){
                //     return this.firstName +' '+this.lastName
                // }

                // 计算属性一般没set方法，只读属性
                fullName:{
                    set:function(newvalue){
                        console.log("------------",newvalue);
                        const names = newvalue.split(' ');
                        this.firstName = names[0];
                        this.lastName = names[1]
                    },
                    get:function(){
                        // return "abc"
                        return this.firstName +' '+this.lastName
                    }
                }
            }
        })
    </script>
</body>
</html>